Visible crew/equipment: When the helicopter pilot watches the kids exiting their home, a cameraman is reflected on his sunglasses. (00:35:50)
Visible crew/equipment: In the scene where Doyle is talking to the helicopter pilot at the park, you can see another pilot on the left side of Doyle's head for a split second. (01:14:50)
Visible crew/equipment: When Jeremy Renner is pushing the car, a cameraman is visible behind him to his right. (01:20:10)
Visible crew/equipment: In the scene where Don is fleeing from the farmhouse he jumps into a boat, and there is a shot about 10:24 in where you can see him in the boat and the infected in the water. However you can also see someone sat in the boat with him, appearing to be holding a camera.
Answer: I suspect that it's really not that simple. Remember that in the first film, Jim was lying alone in a hospital bed for some considerable time before waking to the deserted London. He would certainly not have smelt clean and fresh, yet he was still clearly detectable as prey by the infected. While being nice and clean makes it easy for them, it seems clear that it's not the sole indicator that triggers an attack.
Tailkinker ★